src/code/sparc-vm.lisp

   1 ;;;; SPARC-specific runtime stuff
   2
   3 ;;;; This software is part of the SBCL system. See the README file for
   4 ;;;; more information.
   5 ;;;;
   6 ;;;; This software is derived from the CMU CL system, which was
   7 ;;;; written at Carnegie Mellon University and released into the
   8 ;;;; public domain. The software is in the public domain and is
   9 ;;;; provided with absolutely no warranty. See the COPYING and CREDITS
  10 ;;;; files for more information.
  11 (in-package "SB!VM")
  12 \f
  13 ;;; See x86-vm.lisp for a description of this.
  14 (define-alien-type os-context-t (struct os-context-t-struct))
  15 \f
  16 ;;;; MACHINE-TYPE and MACHINE-VERSION
  17
  18 (defun machine-type ()
  19   "Returns a string describing the type of the local machine."
  20   "SPARC")
  21
  22 ;;; support for CL:MACHINE-VERSION defined OAOO elsewhere
  23 (defun get-machine-version ()
  24   nil)
  25 \f
  26 (defun fixup-code-object (code offset fixup kind)
  27   (declare (type index offset))
  28   (unless (zerop (rem offset n-word-bytes))
  29     (error "Unaligned instruction?  offset=#x~X." offset))
  30   (sb!sys:without-gcing
  31    (let ((sap (truly-the system-area-pointer
  32                          (%primitive sb!kernel::code-instructions code))))
  33      (ecase kind
  34        (:call
  35         (error "Can't deal with CALL fixups, yet."))
  36        (:sethi
  37         (setf (ldb (byte 22 0) (sap-ref-32 sap offset))
  38               (ldb (byte 22 10) fixup)))
  39        (:add
  40         (setf (ldb (byte 10 0) (sap-ref-32 sap offset))
  41               (ldb (byte 10 0) fixup)))))))
  42
  43 \f
  44 ;;;; "Sigcontext" access functions, cut & pasted from alpha-vm.lisp.
  45 ;;;;
  46 ;;;; See also x86-vm for commentary on signed vs unsigned.
  47
  48 (define-alien-routine ("os_context_pc_addr" context-pc-addr) (* unsigned-int)
  49   (context (* os-context-t)))
  50
  51 (defun context-pc (context)
  52   (declare (type (alien (* os-context-t)) context))
  53   (int-sap (deref (context-pc-addr context))))
  54
  55 (define-alien-routine ("os_context_register_addr" context-register-addr)
  56   (* unsigned-int)
  57   (context (* os-context-t))
  58   (index int))
  59
  60 ;;; FIXME: Should this and CONTEXT-PC be INLINE to reduce consing?
  61 ;;; (Are they used in anything time-critical, or just the debugger?)
  62 (defun context-register (context index)
  63   (declare (type (alien (* os-context-t)) context))
  64   (deref (context-register-addr context index)))
  65
  66 (defun %set-context-register (context index new)
  67 (declare (type (alien (* os-context-t)) context))
  68 (setf (deref (context-register-addr context index))
  69       new))
  70
  71 ;;; This is like CONTEXT-REGISTER, but returns the value of a float
  72 ;;; register. FORMAT is the type of float to return.
  73
  74 ;;; FIXME: Whether COERCE actually knows how to make a float out of a
  75 ;;; long is another question. This stuff still needs testing.
  76 #+nil
  77 (define-alien-routine ("os_context_float_register_addr" context-float-register-addr)
  78   (* long)
  79   (context (* os-context-t))
  80   (index int))
  81 #+nil
  82 (defun context-float-register (context index format)
  83   (declare (type (alien (* os-context-t)) context))
  84   (coerce (deref (context-float-register-addr context index)) format))
  85 #+nil
  86 (defun %set-context-float-register (context index format new)
  87   (declare (type (alien (* os-context-t)) context))
  88   (setf (deref (context-float-register-addr context index))
  89         (coerce new format)))
  90
  91 ;;; Given a signal context, return the floating point modes word in
  92 ;;; the same format as returned by FLOATING-POINT-MODES.
  93
  94 ;;; Under SunOS, we have a straightforward implementation in C:
  95 #!+sunos
  96 (define-alien-routine ("os_context_fp_control" context-floating-point-modes)
  97     (sb!alien:unsigned 32)
  98   (context (* os-context-t)))
  99
 100 ;;; Under Linux, we have to contend with utterly broken signal handling.
 101 #!+linux
 102 (defun context-floating-point-modes (context)
 103   (declare (ignore context))
 104   (warn "stub CONTEXT-FLOATING-POINT-MODES")
 105   0)
 106 \f
 107 ;;;; INTERNAL-ERROR-ARGS.
 108
 109 ;;; Given a (POSIX) signal context, extract the internal error
 110 ;;; arguments from the instruction stream.  This is e.g.
 111 ;;; 4       23      254     240     2       0       0       0
 112 ;;; |       ~~~~~~~~~~~~~~~~~~~~~~~~~
 113 ;;; length         data              (everything is an octet)
 114 ;;;  (pc)
 115 (defun internal-error-args (context)
 116   (declare (type (alien (* os-context-t)) context))
 117   (sb!int::/show0 "entering INTERNAL-ERROR-ARGS")
 118   (let* ((pc (context-pc context))
 119          (bad-inst (sap-ref-32 pc 0))
 120          (op (ldb (byte 2 30) bad-inst))
 121          (op2 (ldb (byte 3 22) bad-inst))
 122          (op3 (ldb (byte 6 19) bad-inst)))
 123     (declare (type system-area-pointer pc))
 124     (cond ((and (= op #b00) (= op2 #b000))
 125            (args-for-unimp-inst context))
 126           ((and (= op #b10) (= (ldb (byte 4 2) op3) #b1000))
 127            (args-for-tagged-add-inst context bad-inst))
 128           ((and (= op #b10) (= op3 #b111010))
 129            (args-for-tcc-inst bad-inst))
 130           (t
 131            (values #.(error-number-or-lose 'unknown-error) nil)))))
 132
 133 (defun args-for-unimp-inst (context)
 134   (declare (type (alien (* os-context-t)) context))
 135   (let* ((pc (context-pc context))
 136          (length (sap-ref-8 pc 4))
 137          (vector (make-array length :element-type '(unsigned-byte 8))))
 138     (declare (type system-area-pointer pc)
 139              (type (unsigned-byte 8) length)
 140              (type (simple-array (unsigned-byte 8) (*)) vector))
 141     (copy-ub8-from-system-area pc 5 vector 0 length)
 142     (let* ((index 0)
 143            (error-number (sb!c:read-var-integer vector index)))
 144       (collect ((sc-offsets))
 145                (loop
 146                 (when (>= index length)
 147                   (return))
 148                 (sc-offsets (sb!c:read-var-integer vector index)))
 149                (values error-number (sc-offsets))))))
 150
 151 (defun args-for-tagged-add-inst (context bad-inst)
 152   (declare (type (alien (* os-context-t)) context))
 153   (let* ((rs1 (ldb (byte 5 14) bad-inst))
 154          (op1 (sb!kernel:make-lisp-obj (context-register context rs1))))
 155     (if (fixnump op1)
 156         (if (zerop (ldb (byte 1 13) bad-inst))
 157             (let* ((rs2 (ldb (byte 5 0) bad-inst))
 158                    (op2 (sb!kernel:make-lisp-obj (context-register context rs2))))
 159               (if (fixnump op2)
 160                   (values #.(error-number-or-lose 'unknown-error) nil)
 161                   (values #.(error-number-or-lose 'object-not-fixnum-error)
 162                           (list (sb!c::make-sc-offset
 163                                  descriptor-reg-sc-number
 164                                  rs2)))))
 165             (values #.(error-number-or-lose 'unknown-error) nil))
 166         (values #.(error-number-or-lose 'object-not-fixnum-error)
 167                 (list (sb!c::make-sc-offset descriptor-reg-sc-number
 168                                             rs1))))))
 169
 170 (defun args-for-tcc-inst (bad-inst)
 171   (let* ((trap-number (ldb (byte 8 0) bad-inst))
 172          (reg (ldb (byte 5 8) bad-inst)))
 173     (values (case trap-number
 174               (#.object-not-list-trap
 175                #.(error-number-or-lose 'object-not-list-error))
 176               (#.object-not-instance-trap
 177                #.(error-number-or-lose 'object-not-instance-error))
 178               (t
 179                #.(error-number-or-lose 'unknown-error)))
 180             (list (sb!c::make-sc-offset descriptor-reg-sc-number reg)))))
 181